Schedule of Borrowings (Parenthetical) (Detail)	Sep. 30, 2013	Dec. 31, 2012
4.2% Senior Notes, due December 2021
Debt Instrument [Line Items]
Senior Notes, maturity date	2021-12	2021-12
4.5% Senior Notes, due December 2020
Debt Instrument [Line Items]
Senior Notes, maturity date	2020-12	2020-12
2.58% Senior Euro Notes, due June 2015
Debt Instrument [Line Items]
Senior Notes, maturity date	2015-06	2015-06